When drawing using a CAD software we always draw "real" size (i.e. the scale of 1:1). For example if we draw a box with size 20x20x20 cm we will use 20 drawing units for drawing the sides. Independently of the scale that we will use to print the drawing we will not scale when we draw on the CAD software.
We set the scale only at the printing layout which is prepare at a later stage when the drawing is completed and we are ready for printing. In all CAD software, the printing layouts are always a distinct part of the software that helps us fit the drawing to the paper. In all CAD software, drawing is one thing and printing is another thing.
When is time to print the drawings we set a scale such that the drawing we made on the software fits on a standard paper size and gives a clear and easy to read printed drawing. Below are standard scales for various types of drawings
2.1. Scale for Concrete Structures
- Generally 1:50
- Slab and beam layouts 1:50
- Building sections 1:50
- Concrete columns detail sections 1:20
The paper size will typically be A1 or A2
2.2. Scale for Architectural drawings
- Plans
- Building sections 1:50
- Building views 1:50
The paper size will typically be A1 or A2
2.3. Steel Structures
- General Layout:1:50 or 1:100
- Connection Detail 1:5
The paper size will typically be A1 or A2